Spirit Lake is a city in Kootenai County, Idaho. The population was 1,945 at the time of the 2010 census, up from 1,376 in 2000. It is part of the Coeur d'Alene Metropolitan Statistical Area, which includes the entire county.

Kootenai County is located in the U.S. state of Idaho. As of the 2020 census, its population was 171,362, making it the third-most populous county in Idaho and by far the largest in North Idaho, the county accounting for 45.4% of the region's total population. The county seat and largest city is Coeur d'Alene. The county was established in 1864 and named after the Kootenai tribe.